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为保证LNG储罐混凝土外罐正常操作时受力合理,需要对外罐施加预应力来抵消内部气压、液压以及穹顶自重的作用。本文结合实际项目分别利用公式以及ANSYS软件提取两种方法,计算了外罐及环梁部位环向所需预应力的大小。结果表明,公式计算后外罐底部及环梁处所需预应力值较大,经调整后,外罐底部及顶部所需预应力有所减小,但环梁处相较于调整前有所提升。从所需预应力结果对比可知,软件提取相较于公式计算更为准确经济。经过初步配筋后采用中国、美国以及欧洲规范分别计算环向预应力损失。预应力总损失由锚具变形损失、摩擦损失、弹性变形损失、钢筋松弛损失以及收缩徐变损失等组成,中国、美国以及欧洲规范计算最终结果基本一致。摩擦损失、钢筋松弛损失、混凝土收缩徐变损失所占的比例较大。 相似文献
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Dynamic oxygen storage and release capability (OSC) measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of 0.1 Hz with the inlet gas-flow sequence CO (5S)→O2(5S)→CO→O2 and a flow rate of 300 ml·min^-1. Under this condition, similar regular square wave in the inlet and outlet of the reactor was obtained to guarantee the reliability of the dynamic OSC results. The dynamic OSC performance of the CeO2 and Ce0.67Zr0.33O2 mixed oxide prepared using the citric sol-gel method was studied at the optimum measurement condition with focus on both quantitative and qualitative analyses, The results reveal distinctly that Ce0.67Zr0.33O2 had better dynamic OSC performance because of its higher oxygen migration rate than CeO2. Under dynamic conditions, two CO2 production peaks occurred corresponding to the CO pulse and the O2 pulse, respectively, during the entire cycle. The intensity and ratio between the two CO2 productions were highly influenced by temperature and frequency indicating complex surface phenomena during the oxygen storage/release process, As a result, this set-up can be applied to the evaluation of ceria-based material on the OSC performance. 相似文献
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The constant increase in the number of environ-mental protection regulations worldwide has broughtabout significant restrictions onthe nature and quantityof exhaust gases originating from mobile sources suchas automobile emissions .These increasingly dema… 相似文献
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本文比较了GB 50160-2008《石油化工企业设计防火规范》、SH/T 3007-2014《石油化工储运系统罐区设计规范》和API 2000-1998《Venting Atmospheric and Low-Pressure Storage Tanks Non-refrigerated and Refrigerated》中关于储罐正常呼吸以及事故泄压装置的规范要求,比较了API 650-2007《welded Steel Tanks for Oil Storage》和GB 50341-2014《立式圆筒形钢制焊接油罐设计规范》的弱顶结构设计条件。 相似文献
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